单项选择题

Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references？（）

A. line timing
B. loop timing
C. internal timing
D. through timing
E. external timing

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CCNP(642-321)

Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references？（）